The dread Pirate Roberts Windows version update
Trying to keep W10 update 2004 off my machines (having removed it once) I got really fed up with it trying to re-install and now there is the October update on the horizon. So I managed to find out just exactly how to stop these version updates installing themselves thanks to a computerworld article. So:
If you have W10 PRO (not home) and you want to stay on a particular version ( in my case 1909) then have a look at the bottom of this article which takes you through the (simple) steps to do so using Group Policy:
www.computerworld.com
It seems to have worked OK for me but of course, as usual, make your own choice.
Trying to keep W10 update 2004 off my machines (having removed it once) I got really fed up with it trying to re-install and now there is the October update on the horizon. So I managed to find out just exactly how to stop these version updates installing themselves thanks to a computerworld article. So:
If you have W10 PRO (not home) and you want to stay on a particular version ( in my case 1909) then have a look at the bottom of this article which takes you through the (simple) steps to do so using Group Policy:

How to block Windows 10 version 21H2 (and Windows 11) from installing
Windows 10 21H2 is a very minor update, and you may not want to be a beta tester for Windows 11. Here’s how to keep both of the new releases off your system for now.
It seems to have worked OK for me but of course, as usual, make your own choice.